result: Sherlock 2

Present Perfect Continuous

Unfinished Period

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___ she ____ on something deadlier than a rabbit?
Неужели она работала над чем-то более смертоносным, чем кролик?

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SHERLOCK: So we know that Doctor Stapleton performs secret genetic experiments on animals. The question is: has she been working on something deadlier than a rabbit?
JOHN: To be fair, that is quite a wide field.

Source: Sherlock: Season 2 Episode 2
Timestamp: 32:08